The coroner's office was concerned Walker's recent weight loss may have been a complication in his death, but Spangenberger ruled it out Friday after an autopsy was performed. Friends and co-workers said Walker had lost around 40 pounds in recent months and was focused on living a healthier lifestyle.

Asked if the heart disease had been detected or diagnosed prior to Walker's death, Spangenberger referred to it as a "silent killer."

According to Spangenberger, Walker was an advocate of organ donation and an organ donor himself, which he said will benefit others.